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XMLHttpRequest and AJAX for PHP programmers
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07/24/2005, By James Kassemi
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Although the concept isn't entirely new, XMLHttpRequest technology is implemented on more sites now than ever. Compatibility is no longer an issue (IE, Mozilla and Opera all support it), and the benefits to using it are amazing. There are too many PHP programmers avoiding any work with javascript beyond simple form validation, and for good reason. It's difficult to keep several languages proficiently under your belt. But using the XMLHttpRequest object is not as hard as everybody thinks, and you don't need to buy and memorize another reference manual.
Asynchronous JavaScript and XML, or AJAX is a method of sending and receiving data (usually XML) from a server-side application through javascript. Since javascript offers the ability to change the contents of a web page on-the-fly, this technique allows web programmers to venture closer to programming truly interactive web applications similar to those built with Java and ActiveX.
As PHP developers, it might seem tempting to avoid the use of Javascript and leave it to the dsigner. After all, we aren't usually programming the UI, but the processing components required by the UI. The distinction between the two is disappearing. Here's a simple diagram that demonstrates just how AJAX works:
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